Strategy - Number Line (single and double digit)
There are lots of tools you can use to help you add and subtract numbers. A number line is one of those tools.
Watch the video below to see how to use a number line to add and subtract numbers. In what ways do you find the number line helpful?
If you do enough practise, you might be able to add and subtract by picturing a number line in your head! Until then, you can use these tips to help you.
When adding to a number, jump forward (to the right).
When subtracting from a number, jump backwards (to the left).
Examples
Question 1
Use the number line to find the answer to $4+7$4+7.
First place the bigger of $4$4 and $7$7 on the number line.
Use the position of $7$7 to find the place of $4+7$4+7 on the number line.
Question 2
Use the number line to find the answer to $9-4$9−4.
First place $9$9 on the number line.
Place $4$4 on the number line.
Use the number line to work out the difference between $9$9 and $4$4.
Question 3
Use the number line to find the answer to $59-4$59−4.
First place the bigger of $59$59 and $4$4 on the number line.
Use the position of $59$59 to find the place of $59-4$59−4 on the number line.